| 摘要 |
This invention uses a 4-line color CCD sensor including four line sensors Y, R, G, and B. In a low-speed color read mode, outputs from these sensors are processed by A/D converters and subsequent processing units provided in one-to-one correspondence with the sensors. In a high-speed monochromatic read mode, an output from the Y sensor is divisionally processed by using A/D converters and subsequent processing units provided in one-to-one correspondence not only with the Y sensor but also with the other R, G, and B sensors. This provides an image reading apparatus usable in both the high-speed monochromatic mode and the low-speed color mode and capable of achieving high speed, high accuracy, and low cost.
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